1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 21.100.10 ISBN 0-626-16509-1 SANS 12302:2005Edition 1ISO 12302:1993Edition 1SOUTH AFRICAN NATIONAL STANDARD Plain bearings Quality characteristics St
4、atistical process control (SPC) This national standard is the identical implementation of ISO 12302:1993 and is adopted with the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012
5、428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 12302:2005 Edition 1 ISO 12302:1993 Edition 1 Table of changes Change No. Date Scope Abstract Specifies for plain bearings (except thick-walled half-bearings) those quality characteristics in accordanc
6、e with SANS 12301 which can be used to regulate and control a production process on the basis of statistical process control (SPC). Keywords bearings, plain bearings, production, production control, quality, quality control, statistical quality control. National foreword This South African standard
7、was approved by National Committee StanSA TC 5120.02, Bearings, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. INTERNATIONAL STANDARD First edition 1993-11-15 Plain bearings - Quality characteristics - Statistical process control (SPC) P
8、aliers lisses - Caractbistiques de qua/it6 - Con trdle sta tistique du pro - optional with “(yes)“; - unsuitable with “no”. Those quality characteristics which are marked with “(yes)” and “no” are accompanied by an explanation in the column “remarks” in table 1. A horizontal dash (-) in a column mea
9、ns that this characteristic is not relevant for the specific type of plain bearing. 1 IS0 12302:1993(E) Table 1 Subclause No. (according to IS0 12301) Quality characteristic Type of plain bearing Thin- Thick- Thrust walled walled Wrap- Solid Thermo- washer half- half- Ped metal plastic Sintered (rin
10、g Remarks bear- bear- bush bush bush bush and m ing half) a b C d 8 f g 6.1 Wall thickness 6.1 .l Line measurement no - no no no no - a and c to f: There is an unlimited number of values on a single measur- ing line ranging between minimum and maximum 6.1.2 Point measure- ment (defined) yes - (yes)
11、Yes Yes (yes) yes c: Only where it is possible to meas- ure at predetermined points f: For closed tolerance requirement, 100 % grading may be requested as an alternative to SPC 6.2 Outside diameter - - Yes yes Yes Yes (yes) g: Blanking tool; tool checking by means of initial product acceptance with
12、each order 6.3 Inside diameter - - (yes) Yes Yes Yes (yes) c: Normally determined by wall thick- ness and outside diameter g: Blanking tool; tool checking by means of initial product acceptance with each order 6.4 Width (yes) - (yes) (yes) (yes) (yes) - a and c to f: Not a primary character- istic 6
13、.5 Locating features no - - - - - no a and g: Are only locating aids 6.6 Lubricant feed and no - distribution fea- tures no no no - no a, c to e and g: Not a primary charac- teristic 6.7 Surface conditions no - no no no no no a and c to g: No Gaussian distribution of measured values 6.8 Crush height
14、 yes - - - - - - 6.9 Free spread (yes) - - - - - - a: Not a primary characteristic 6.10 Straightness of sliding surface no - - - - - - a: Graphical evaluation in most cases 6.11 Joint face taper (yes) - - - - - - a: Not a primary characteristic 6.12 Back contact (pro- portion of surface area) no - -
15、 - - - - a: Attribute (qualitative) characteristic 6.13 Joint displacement - - (yes) - - - - c: Will be adjusted when fitting the bush into the housing bore; attribute characteristic 6.14 Height of thrust - - - - - - half-washer (thick- ness) (yes) g: Blanking tool; tool checking by means of initial
16、 product acceptance with each order 2 IS0 12302:1993(E) Type of plain bearing Thin- Thick- Thrust Subclause No. (according to Quality walled walled Wrap- Solid Thermo- characteristic half- half- Ped metal plastic Sintered wlaih:r Remarks IS0 12301) bear- bear- bush bush bush bush and ing ing half) a
17、 b C d 8 f g 6.15 Flatness - - - - - - no g: Attribute (qualitative) characteristic 6.16 Flange diameter (yes) - (yes) (yes) (yes) (yes) - a and c to f: Not a primary character- istic 6.17 6.18 Distance between flanges Flange thickness (yes) - (yes) - (yes) (yes) (yes) (yes) (yes) (yes) (yes) - (yes
18、) - a and c to f: Not a primary character- istic a and c to f: Measuring point shall be defined 6.19 Perpendicularity (squareness) of flange (yes) - (yes) (yes) (yes) (yes) - a and c to f: Not a primary character- istic 6.20 Geometric devi- - - - ations (yes) (yes) (yes) - d, e and f: Not a primary
19、characteristic 7 Material quality characteristics Control of the material manufacturing processes de- pends on a large number of parameters which involve “process-knowledge”. The manufacturer shall decide which parameters are to be checked using statistical techniques in accordance with customer require- ments. 3 Standards South AfricaThis s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .
